diff --git a/src/g_levellocals.h b/src/g_levellocals.h
index 7e3666100..d7c3ad770 100644
--- a/src/g_levellocals.h
+++ b/src/g_levellocals.h
@@ -432,6 +432,7 @@ public:
 
 	TArray<vertex_t> vertexes;
 	TArray<sector_t> sectors;
+	TArray<extsector_t> extsectors; // container for non-trivial sector information. sector_t must be trivially copyable for *_fakeflat to work as intended.
 	TArray<line_t*> linebuffer;	// contains the line lists for the sectors.
 	TArray<subsector_t*> subsectorbuffer;	// contains the subsector lists for the sectors.
 	TArray<line_t> lines;
diff --git a/src/maploader/maploader.cpp b/src/maploader/maploader.cpp
index 1d008f6b3..779e901a6 100644
--- a/src/maploader/maploader.cpp
+++ b/src/maploader/maploader.cpp
@@ -1066,6 +1066,7 @@ void MapLoader::LoadSectors (MapData *map, FMissingTextureTracker &missingtex)
 
 	unsigned numsectors = lumplen / sizeof(mapsector_t);
 	Level->sectors.Alloc(numsectors);
+	Level->extsectors.Alloc(numsectors);
 	auto sectors = &Level->sectors[0];
 	memset (sectors, 0, numsectors*sizeof(sector_t));
 
@@ -1078,12 +1079,9 @@ void MapLoader::LoadSectors (MapData *map, FMissingTextureTracker &missingtex)
 	ms = (mapsector_t*)msp.Data();
 	ss = sectors;
 	
-	// Extended properties
-	sectors[0].e = new extsector_t[numsectors];
-
 	for (unsigned i = 0; i < numsectors; i++, ss++, ms++)
 	{
-		ss->e = &sectors[0].e[i];
+		ss->e = &Level->extsectors[i];
 		ss->Level = Level;
 		if (!map->HasBehavior) ss->Flags |= SECF_FLOORDROP;
 		ss->SetPlaneTexZ(sector_t::floor, (double)LittleShort(ms->floorheight));
diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index 3f1520d55..785d43df2 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -314,11 +314,6 @@ void FLevelLocals::ClearLevelData()
 	DialogueRoots.Clear();
 	ClassRoots.Clear();
 
-	// delete allocated data in the level arrays.
-	if (sectors.Size() > 0)
-	{
-		delete[] sectors[0].e;
-	}
 	for (auto &sub : subsectors)
 	{
 		if (sub.BSP != nullptr) delete sub.BSP;
@@ -335,6 +330,7 @@ void FLevelLocals::ClearLevelData()
 	canvasTextureInfo.EmptyList();
 	sections.Clear();
 	segs.Clear();
+	extsectors.Clear();
 	sectors.Clear();
 	linebuffer.Clear();
 	subsectorbuffer.Clear();